Quadrajet and manifold question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Shortbed · 05-01-2005, 01:36 PM

I've got a '71 with a 307 and standard 2bbl carb. Will a '71 4bbl manifold and quadrajet fit this? Will I need to swap throttle linkage, gas lines or what all is involved? I don't want to mess with it if it's a lot of hassle.

dwaite72lnghrn · 05-01-2005, 09:18 PM

If the manifold is off a SBC then it will fit. The only thing is that a Q-jet is more carb then that engine can handle. Unless you have a really big cam and ported heads and big headers. '71 and up I think all used cable for gas pedal so as long as the carb has the bracket on the back for the cable linkage you can use it.

Green Machine · 05-01-2005, 09:47 PM

I would have to respectfully disagree that the q-jet is to big for a 307. Small prmaries and a vacuum operated secondary will feed it only what if can take. Maybe some rejetting and adjustment required, but anything would beat a worn out mini 2 bbl IMHO.

Fuel line on Q-jet is 3/8 and your 307 will have 5/16 from the pump, will have to alter fuel line anyway as 2bb is in differnt location. Might be best to swap fuel pump to 350 style and run all new 3/8 steel line from pump.

BTW I have run a q-jet on a 283 in the past and currently have a holley 650 spreadbore on a cast q-jet intake on my cuurent 307, only mod is a small (262) cam.

71Shortbed · 05-01-2005, 10:14 PM

Thanks guys. After some research I think I'm going to go with an aluminum intake and a 600cfm carb. By the time I pay shipping on a used iron manifold I can buy a nice used aluminum Edelbrock. Sounds like I should be ok with the linkage and I'll redo the fuel line.

GMC AMI · 05-02-2005, 06:56 AM

Here is my 307 after the swap. You will like yours better for sure.

71Shortbed · 05-02-2005, 07:12 AM

Wow. That looks much better Mike. What carb are you running?

Thanks

70c10 · 05-02-2005, 07:22 AM

Sharp looking motor Mike!

05-01-2005, 01:36 PM	#1
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Quadrajet and manifold question I've got a '71 with a 307 and standard 2bbl carb. Will a '71 4bbl manifold and quadrajet fit this? Will I need to swap throttle linkage, gas lines or what all is involved? I don't want to mess with it if it's a lot of hassle.

05-01-2005, 09:18 PM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	If the manifold is off a SBC then it will fit. The only thing is that a Q-jet is more carb then that engine can handle. Unless you have a really big cam and ported heads and big headers. '71 and up I think all used cable for gas pedal so as long as the carb has the bracket on the back for the cable linkage you can use it. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

05-01-2005, 09:47 PM	#3
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	I would have to respectfully disagree that the q-jet is to big for a 307. Small prmaries and a vacuum operated secondary will feed it only what if can take. Maybe some rejetting and adjustment required, but anything would beat a worn out mini 2 bbl IMHO. Fuel line on Q-jet is 3/8 and your 307 will have 5/16 from the pump, will have to alter fuel line anyway as 2bb is in differnt location. Might be best to swap fuel pump to 350 style and run all new 3/8 steel line from pump. BTW I have run a q-jet on a 283 in the past and currently have a holley 650 spreadbore on a cast q-jet intake on my cuurent 307, only mod is a small (262) cam. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 05-01-2005 at 09:51 PM.

05-02-2005, 06:56 AM	#5
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	Little old 307 Here is my 307 after the swap. You will like yours better for sure. Attached Images __________________ 1968 Chevy 4x4 307 4 speed

05-02-2005, 07:22 AM	#7
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Sharp looking motor Mike! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-01-2005, 10:14 PM	#4
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Thanks guys. After some research I think I'm going to go with an aluminum intake and a 600cfm carb. By the time I pay shipping on a used iron manifold I can buy a nice used aluminum Edelbrock. Sounds like I should be ok with the linkage and I'll redo the fuel line.

05-02-2005, 07:12 AM	#6
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Wow. That looks much better Mike. What carb are you running? Thanks

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.